CCSS.Math.7.G.1-3 (1a) - Classify Triangles by Sides and Angles

Good Morning Girls and Boys,

Now that you know everything you need to know about angles, you will be building on that knowledge with TRIANGLES!  Triangles are closed figures with 3 sides and 3 angles.  
(So, do you know what the prefix tri means?  What about the meaning of a closed figure?) 
Mathematicians classify triangles in 2 ways.  One way is by the angles- ACUTE TRIANGLE is when all 3 angles are acute angles- OBTUSE TRIANGLES have 1 obtuse angle- and lastly, RIGHT TRIANGLE is when there is a right angle.  Sounds quite logical, right?  The second way a triangle is classified is by the length of the sides.  There are 3 names for this category: SCALENE TRIANGLE is when NO sides are congruent, ISOSCELES TRIANGLES is when there are 2 congruent sides, and lastly, EQUILATERAL TRIANGLES is when 
all 3 sides are congruent. 
Besides classifying triangles by names, there is another fact about all triangles ------- The SUM ( adding all the angle measures) of all 3 Angles for EVERY TRIANGLE = 180* .  This fact is very useful in solving many Triangle problems.   
 Make sure to ask questions if you have them especially after watching the videos and taking notes.  

This is Jillian skiing down Shawnee Peak!  Looks like she really enjoys this!  

Check out the videos on Classifying TRIANGLES in the Geometry Standards tab above.  Make certain to take complete notes and vocabulary terms ( meaningful definitions and examples for each) in your graphic organizer.

As always in MATH,

Mrs M